Senior Airman Louie Caraballo, 633rd Security Forces Squadron installation entry controller, lays prone near a tree line to prevent opposing forces from breaching the perimeter during an Agile Combat Employment exercise at Joint Base Langley-Eustis, Va., Aug. 8, 2023. The SFS conducts annual training on security tactics and procedures to better equip defenders to guard against potential threats on the installation and abroad. (U.S. Air Force photo by Airman 1st Class Ian Sullens)